DELL Computers Carlo Tala Deception used to entice me to sign up for Credit Account, Internet

Back in April of 2009, I bought a computer and monitor by phone.  The sales representative, a Mr. Carlo Tala, wanted me to sign up for a Dell Preferred Account, or basically a credit account.  To entice me to do so, he offered me a $200 gift card that I would receive through the mail. 

I said that it sounded enticing but that he would also have to agree to take $100 off my order.  He talked to the supervisor and he agreed to do so.  I have waited for months on end for that gift card but to no avail.  It is now December 1st, and I called Dell.  They transferred me to every goddamn place you can imagine and every one of them say there is nothing they can do. 
They say the only way I can get my $200 gift card is if I speak with the representative himself...but the problem is that he, according to 2 separate dell employees, no longer appears to work there.  Those f***ers scammed me and there is nothing, not even the managers, say they can do about it.  I was on the phone for hours only to be completely frustrated.

 If a lawyer is reading this, please give me a call to teach Dell a lesson about this matter.  I personally pleaded with Dell to try to do something, anything, to transfer me to managers, but I always come up with nothing.  Twice I got disconnected after waiting for half an hour each time.